Multisite scablabity questions

Hi there mates down under! We are thinking deeply about Multisite for use i a project that could have a lotttttt of clients.
What are your experiences as far as pushing big numbers like 500s to many thousands of different sites and customers. Good news the sites are going to be very simple landing page sites . Other fact each client could have more then one landing page would prefer a common back end.

1 Is that even reasonable ?
2, what addition tools like support dash board tools etc.
3. Maybe we should look at a custom development

That really depends - network with only landing pages is absolutely possible with WordPress - if this is so simple as you described then you don't have to go with custom development.
If you have to have some specific functions - then still it could be easier to add those function to WordPress than building full system from scratch.

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